/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hive.contrib.udf.example;
import java.util.List;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
/**
* UDFExampleArraySum.
*
*/
@Description(name = "example_arraysum", value = "_FUNC_(expr) - Example UDAF that returns the sum")
public class UDFExampleArraySum extends UDF {
public Double evaluate(List<Double> a) {
if (a == null) {
return null;
}
double total = 0;
for (int i = 0; i < a.size(); i++) {
Double e = a.get(i);
if (e != null) {
total += e;
}
}
return total;
}
}